package 事务操作;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;

public class Transaction {
    public static void main(String[] args) {
        String url = "jdbc:mysql://localhost:3306/db_jdbc_demo?characterEncoding=utf8&useSSL=false&serverTimezone=UTC";
        String user = "root";
        String pass = "1234";
        Connection conn = null;
        Statement stmt = null;

        try {
            Class.forName("com.mysql.jdbc.Driver");
            conn = DriverManager.getConnection(url,user,pass);
            String sql1 = "update t_account set money = money - 5000 where id = 1";
            String sql2 = "update t_account set money = money + 5000 where id = 2";
            //开启事务
            conn.setAutoCommit(false);
            stmt = conn.createStatement();
            int i = stmt.executeUpdate(sql1);
//            int x = 5/0;
            int j = stmt.executeUpdate(sql2);
            if(i+j==2){
                System.out.println("转账成功！");
                conn.commit();
            }else{
                System.out.println("转账失败！");
            }

        } catch (Exception e) {
//            e.printStackTrace();
            System.out.println("转账出现异常！");
            try {
                conn.rollback();
            } catch (SQLException ex) {
                ex.printStackTrace();
            }

        }finally {
            try {
                stmt.close();
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }


    }
    }


